const mysql=require('mysql')

var con=mysql.createConnection({
    host:'192.168.187.144',
    port:3306,
    user:'root',
    password:'ddd',
    database:'mydatabase'
})

var userName=process.argv[2]
var deleteSql='delete from users where userName=?'

con.query(deleteSql,[userName],(err,result)=>{
    if(err){
        console.log(err)
    }else{
        console.log(result)
    }
})